Na3AlF6-K3AlF6-AlF3熔体中电解制备Al-Sc中间合金的工艺研究

在Na₃AlF₆-K₃AlF₆-AlF₃熔盐体系中,采用电解法制备Al-Sc中间合金,研究了阴极电流密度、电解时间、氧化铝及氧化钪加入量对电流效率的影响,并采用XRD和SEM对阴极析出产物进行了微观分析。结果表明: 在电解温度950 ℃时,Na₃AlF₆-K₃AlF₆-AlF₃熔体中电解制备Al-Sc中间合金的最佳实验条件为: 氧化铝加入量1.0%、氧化钪加入量3.0%、电解时间90 min、阴极电流密度1.5 A/cm2,在此条件下平均电流效率为82.91%,阴极析出产物呈大小不均的球状颗粒,由Al相和Al3Sc相组成。

Preparation of Al-Sc Master Alloy in Na3AlF6-K3AlF6-AlF3 Melts by Electrolysis

The Al-Sc master alloy was prepared in the Na₃AlF₆-K₃AlF₆-AlF₃ melts by electrolysis. The influence of cathode current density, electrolysis time, the addition of alumina and scandium oxide on current efficiency was studied. And the precipitated product on the cathode was microscopically analyzed by using XRD and SEM. An experiment for preparing Al-Sc master alloy in Na₃AlF₆-K₃AlF₆-AlF₃ melts by electrolysis at 950 ℃ for 90 min is optimally conducted by adding 1.0% of alumina and 3.0% of scandium oxide, with the cathode current density of 1.5 A/cm2.The results show that the average current efficiency is 82.91%, and the cathode precipitated products being composed of Al phase and Al3Sc phase are spherical particles with uneven size.